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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * This file is part of FFmpeg. |
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| 3 | * |
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| 4 | * FFmpeg is free software; you can redistribute it and/or |
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| 5 | * modify it under the terms of the GNU Lesser General Public License |
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| 6 | * as published by the Free Software Foundation; either |
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| 7 | * version 2.1 of the License, or (at your option) any later version. |
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| 8 | * |
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| 9 | * FFmpeg is distributed in the hope that it will be useful, |
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | * GNU Lesser General Public License for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU Lesser General Public License |
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| 15 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 17 | */ |
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| 18 | |||
| 19 | #ifndef AVUTIL_DYNARRAY_H |
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| 20 | #define AVUTIL_DYNARRAY_H |
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| 21 | |||
| 22 | #include "log.h" |
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| 23 | #include "mem.h" |
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| 24 | |||
| 25 | /** |
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| 26 | * Add an element of to a dynamic array. |
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| 27 | * |
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| 28 | * The array is reallocated when its number of elements reaches powers of 2. |
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| 29 | * Therefore, the amortized cost of adding an element is constant. |
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| 30 | * |
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| 31 | * In case of success, the pointer to the array is updated in order to |
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| 32 | * point to the new grown array, and the size is incremented. |
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| 33 | * |
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| 34 | * @param av_size_max maximum size of the array, usually the MAX macro of |
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| 35 | * the type of the size |
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| 36 | * @param av_elt_size size of the elements in the array, in bytes |
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| 37 | * @param av_array pointer to the array, must be a lvalue |
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| 38 | * @param av_size size of the array, must be an integer lvalue |
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| 39 | * @param av_success statement to execute on success; at this point, the |
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| 40 | * size variable is not yet incremented |
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| 41 | * @param av_failure statement to execute on failure; if this happens, the |
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| 42 | * array and size are not changed; the statement can end |
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| 43 | * with a return or a goto |
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| 44 | */ |
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| 45 | #define AV_DYNARRAY_ADD(av_size_max, av_elt_size, av_array, av_size, \ |
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| 46 | av_success, av_failure) \ |
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| 47 | do { \ |
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| 48 | size_t av_size_new = (av_size); \ |
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| 49 | if (!((av_size) & ((av_size) - 1))) { \ |
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| 50 | av_size_new = (av_size) ? (av_size) << 1 : 1; \ |
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| 51 | if (av_size_new > (av_size_max) / (av_elt_size)) { \ |
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| 52 | av_size_new = 0; \ |
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| 53 | } else { \ |
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| 54 | void *av_array_new = \ |
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| 55 | av_realloc((av_array), av_size_new * (av_elt_size)); \ |
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| 56 | if (!av_array_new) \ |
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| 57 | av_size_new = 0; \ |
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| 58 | else \ |
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| 59 | (av_array) = av_array_new; \ |
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| 60 | } \ |
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| 61 | } \ |
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| 62 | if (av_size_new) { \ |
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| 63 | { av_success } \ |
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| 64 | (av_size)++; \ |
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| 65 | } else { \ |
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| 66 | av_failure \ |
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| 67 | } \ |
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| 68 | } while (0) |
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| 69 | |||
| 70 | #endif /* AVUTIL_DYNARRAY_H */ |